gimp: Update to 2.10.20

Changelog:
Overview of Changes from GIMP 2.10.18 to GIMP 2.10.20
=====================================================

Tools:

  - Crop tool now has a "Delete cropped pixels" option active only in
    image crop mode, allowing to choose whether to crop layers or only
    the canvas (cropped pixels will be made invisible as out-of-canvas
    but would still be present). The option is unchecked by default,
    as it is the non-destructive behavior, which also means the
    default behavior is changed.
  - Crop tool in image crop mode will not crop layers with "Lock
    pixels" on, anymore, even if "Delete cropped pixels" is checked.
  - Painting tools can now restore opacity and blend mode from
    presets.

User interface:

  - Image / Precision renamed to Image > Encoding
  - Tool groups can now display their tool list on hover rather than
    on click. This can be set in Preferences, in the Toolbox tab.
  - Improved update notification GUI in About dialog, and now also
    showing an update comment when one was set in gimp_versions.json.
  - Palette Editor dockable: the color index in the current palette is
    now shown in front of the color name.

Plugins:

  - In file-psd, make the data_start and data_len fields of the
    PSDimageres and PSDlayerres structs unsigned, to avoid potential
    overflow/sign-extension
  - file-raw: Canon CR3 files are now properly recognized by GIMP and
    sent to your raw developer software of choice.
  - PNG and TIFF export: "Save color values from transparent pixels"
    defaults now to not saving color values (i.e. channels set to 0)
    when alpha channel is present and 0 itself.
  - PDF import: multi-pages are now imported in bottom-first order,
    similar to animated formats, and also similar to defaults for PDF
    export. This brings consistency but break existing behavior, hence
    needs to be noted.
  - Added support for exporting 16-bit PSDs, read and write channels
    from/to PSd in the right order

Filters:

  - The 'Vignette' filter now has on-canvas controls
  - New 'Filters -> Blur -> Focus Blur' filter with on-canvas controls
    to emulate out-of-focus blurring
  - New 'Filters -> Blur -> Variable Blur' filter that uses an aux
    mask input to blur an image with variable intensity
  - New 'Filters -> Light and Shadow -> Bloom' filter

Updated translations:

  - British English, Catalan, Chinese (Taiwan), Dutch, Finnish,
    German, Greek, Italian, Korean, Polish, Romanian, Russian,
    Spanish, Swedish, Turkish, Ukrainian

Icons:

  - Replace fileicon.ico with version contain 24x24, 64x64, 128x128,
    and 256x256 sizes for Windows icon
  - Replace wilber.ico with version containing 128x128 size of Windows
    icon

Bug fixes:

  - #189, #354, #872, #1439, #3405, #3533, #3558, #3777, #3841, #4094,
    #4328, #4363, #4487, #4618, #4641, #4663, #4696, #4734, #4745,
    ##4793, 4827, #4846, #4858, #4871, #4895, #4904, #4919, #4967,
    ##4968, #4992, 4996, #5009, #5010, #5033

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